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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93a880289f05d1ca9414726e7a6c70e812a8c7343b1155bc941af36362aca56' 
  AND token = 'I/xt//7WX8kP2KPTu9dZvUw2NU+MOvR20ErBpwIt/EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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