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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaef8e3df953ba0c27756a34ad423eddc0f5c83724aed53ed9aaef8a82b25374' 
  AND token = 'MjlgUhPVQCWOI2kRnXhOebh+h8e0GMlzQLlALgClt9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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