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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1be60d440c079324ce0e586560a1689ab2ede64035a5302189f47eb5b23729f' 
  AND token = 'QmmxRew/6iBR0TPC6n15mt1FwSqsh++wEwI57LGb444=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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