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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a9c3aec9516a0f5fe157eb1e83623d964bd7af0b63167e82dd976998121d41' 
  AND token = 'o4DfdmC+UF0n8dUy3VR7ICLf3uK5WuXytE52jdbVGrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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