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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '463082f18288bb3aa58b3d3b2e1ea75848bb70b98d4e3e59da3cf6edfb16307e' 
  AND token = 'uyBZUSFfapx4gCdtfgUtDi0V/AWDcOeAAobGQQaSr08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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