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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6aca3f0234ea5fee131295da2043575ef2fc0e2d4c557859f60f9ac3ff1c498' 
  AND token = 'HA6dz2TxySee0YIVIEpe+FwBH7AP9yTz4rRlOK7Intw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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