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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bade65d1093910b2b313404693f9e59dcad018f31581709e1b4a995d9f5f4b4c' 
  AND token = 'fctpGK4rL6eMbqvrJ3VpazDoqtu3jH/wRC3zq9lWZss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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