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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2d11e9684aaaa2c0358ca32b8955bb44ebb8f1aeaf01d87ffa341f872c1bae' 
  AND token = 'NocSH4ia51eUSv9BXOJRqmr23KtC5EUNdJtrDpzV8ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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