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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4095d7f033001aebf4acd9b1c31d629dae1250c3a6679f0adfb1249919cc8aee' 
  AND token = '6BEBrbkqfzMmrW3cCGPpuvYCTZZKMeWvBZ1yJQh0lkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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