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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b360923263fa6e4428cbf2932d292c307ada6831d40abb86f82e42f9e49ad58f' 
  AND token = '1RCiU5nD1peoSbwmZrY1boypTlT1uZHnAhRN3tX7GaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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