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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f1c9f5495df8f07c41dad2f1bd236f9d23e13776ecc26ab9f9f7b2a09342bb' 
  AND token = 'uy8A9FExGLaMUViQWzAgwNF2D/uG2ovX/Sa5fWRdOUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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