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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f425f4fb7965928b0e9dc6d4e884ffb4496cc132f31907df007e24a4d951bb8c' 
  AND token = 'SZWrfRHgfdZ/Ikv6zRJeW13NbftExbNiY8vVDIL0QTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}