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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a93d945ba4068bab726ccb8efcaefbc05430b30165c6652d844392cc501075' 
  AND token = 'A0fjoFzo4r7diPgtakOEFNx9hs5/CIUC780U2W4WcWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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