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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1dc2b9f83096dc7f7d1790fe6d9e1c1b30f06473a45b88c9f6199a5ada02542' 
  AND token = 'tab2luHmJnLRj7M6RC3i1Gckw74S8J+Jphzqf8jtpfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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