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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6725ae7816e12f9e826bbb835d1cfb63ae47ea251989f7f6ce4663ca52658855' 
  AND token = '/RXJMoytpgj58sfIroXmCkAC4DowjAFJRnvXJOc18gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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