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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfc51aac8128ea8f1105b657279772cb93f4a5428bfa2a2f5d08c5af1a576e9' 
  AND token = 'zUgh9bC4M8Mdb1P6Y4qHji+iSwnEXvmHGcxFY3+bfYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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