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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '122a450e4463bdfac5d5a1d58235fa05214c6aa2384edfd95da8208b39930b98' 
  AND token = 'CqPJsD/0q6S1X3mkfWg0f+Yoy+6dVGRcT1JELHII1po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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