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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ffc0a36837e6f09a2b8d469ab20f1ffbba3a220f22dd84369d9d3afbb53434' 
  AND token = '32bXntE8chEt+iWMgGRDNn4aFThkP2ztLvmXvX8Ujx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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