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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd88df2a061e5b7204948078e1a3f98fcb405ed072af6d5e6798d260d930bbf' 
  AND token = 'kUw4QA8TVh7eepLNeHbIfo68+hk7DLeXjINAiPI2mZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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