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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83008040a891ba95b9cc14d2bd2e23f15db625741e91a0ab4292d2be57e6f32b' 
  AND token = 'TOhHN9l71mtHE650tWT7yWluaWTE7hF8VeVc6vR8O0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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