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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe40884a01a103df673ef06405232678bc9ca61fa6f2018d1c40dea610e216b' 
  AND token = '6Ym4LXKMrk8U/bUmASSogqIDTLxAh9qsk3gigyW+74Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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