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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a9a7f63af455771b6feb3f953b0e1c3b40f4c39bb95a4b73da3b7f2472a13c' 
  AND token = 'X/TthzyKxEPQANi7xu5bSIRN9nptDL6KiSm87DKdFX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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