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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c692534b284a240dacbae63ae586bb48d5627c471b5414d3173191529963e39' 
  AND token = 'rLVyUzux8iIAzH4llSIl3MCyp/SAJIIdeybW9Xyu+ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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