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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90c96e58120019d6e5d7f4e55e632cd52a3df038f74cb3be5b19da6e0e43fb9' 
  AND token = 'ZvrxJWar8g138AWjBCqbHH5hy7+yZktRk7Ttkkm/alM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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