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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b082768218a8b1b2811fef8c2e1c0813e8dc1221aef99fcc2e36a510fefdf1eb' 
  AND token = 'OYUWKhgyl7wa4z3nvJdfKvhUypv9w1KEShE3gHLu1rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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