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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb84311fc9f13f8c2c9aabe3df43c2844b23c72bd7b6e0f096a5d42bbd7ff737' 
  AND token = '2wp/O0Lzg3yn5pb/IHls+pI5CU34goPcMhQN9gmclLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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