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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7f81b979e9f80559511c3a5151a7815c9a7f4a3cb4500b66c309cc99f00c371' 
  AND token = 'ButpwxiOZ339z2IIdK/02maNGHOehNJCDXbcib9qDn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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