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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc4679bee47ddd95ad2c95209c1567cc25288384385e24e52c927622eb531d0' 
  AND token = 'TbNB20SkI7l7pk9tcPaI58USNs+X8e53EN6JO5SxAOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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