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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27090ed73e62b1f179d7090d12b444c2f2b14af58ba035e71abd3a8281e01c66' 
  AND token = 'CQt1jBYMSF8f5UYQ2bGhEGCKwrSf0s1BMuLQz3CevRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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