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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '182b32e1bb7f64c304e315f8e89552a24ad4cc3fd061958de525ccd48948716a' 
  AND token = 'NUymxucPrDFjn93OQNGmb3/6jk5ZRpgFxgTj3neFYrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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