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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0bab7225b90e6ebb482ecc92062da2cd7d0c7f3def5762f960d902b9484954' 
  AND token = 'hSV3PS/Mw2buIXjA9I8a5UYYAsBstZV6PJwelImR9hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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