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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '421379efb4db27ceaed498fe376cb4e1fa1d0ab018e42f5ddd273b41b95ad117' 
  AND token = 'PfolO5/btmxXshE7b5VEvbWAGec3ZYxV2NkGZN9LKa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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