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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17687027323eeb08c74bfdf6c00e63deeec68feb4fba1b908c064fc4b1cf27a4' 
  AND token = '95b6plb5oKKpYsc8fr0jtykqSrpDOnd61qIGUH1n2OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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