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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866fd55015ba3839dac10fc9486102ca2d122faf4cf6f3a9a6d9b95cdd8b3926' 
  AND token = 'vYnynEnTaLK3OcefnK63QuBLqwE0sX77KxrM/Ncuda8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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