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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d02632cf15ed54c5fb902f5c032d98f793f690645132658614b1a42eb9fca61' 
  AND token = 'vVg35Gk4ikBN8W+nIqR4aj0Xe60yAWlVsNSCKk4ILS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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