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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c692cdbd2ff4143184e0f406177011d0b1ee1021c8056c75abfd3cfc4dfa905' 
  AND token = 'I/0903DMTRj8xRXs3WlRD66/PGotyrxvASd+FJs/7jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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