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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3268ea8b5471ecd77e496840c9b0f37670819fb65ca793a1b7680ae9eb6a6184' 
  AND token = 'C70bgE6dV9hk1Hjz7LWwkMH+yKn4JDGd0FIztsPqxzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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