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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12b0dcdff6164c0fc3d2a604f1ee5a96ca4f35a77c99d8e2ed362e13b12a519' 
  AND token = '+mXdi7h21AI/bGYQ0c5Tosn0vm9tLriY8jHfr46uwBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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