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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1af5a36e0f76f8db61e687796ece4dd620b7a0c8828a8e14492f9fc9601a737' 
  AND token = 'a0M8v9+3rxboKd27MCkbMVputi/pJXuBrUxAO8C0LM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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