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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb190c05e8f6983e4ab547aa6e8dc2a52c125c0468d5b0c63b0d14cf6117048b' 
  AND token = '+Y37y8nyYdf/T1t1QaJQiWqR+xFRWbF4K+K0M7GauVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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