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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b75e8ac72aa5c031d10b99a5772192a59a92c9362100910160f53ce53e86530c' 
  AND token = 'mBkcQN4AJtiojDTc02iyOEwaxK7NVE1bd3LU9tf7mkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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