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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f9656d80fdfc9a133a4b85d1bda066c0edf6e2c4db26e304fb923072a20ce9' 
  AND token = 'b9mAEDMHOcsAhH8c3Gfnhwfe91yJkJ4x8S2tSMShl1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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