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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf94f0fa9998f6ca085c4e59bd7b6ae23a3b78a4071de7036d6ea9318fed5a0' 
  AND token = 'WJLnKhM96gMruq4W/abkyOncxDc8SNsC+RzRXMpDahg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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