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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c04d45f1a52bc5cddcd0a527b7548bf94860aaa68ce8b2d209082efc4f30d3e' 
  AND token = 'kfBYtcH9DoH/R8OniYp4aiv0H8vqFZW0g7MioSmnygA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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