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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec1322d511129d21856801a249f71baf17769595c7b863cc98d13322edf7eff1' 
  AND token = 'eGIMkSsXRYG29fUI2aij0XSOW8iAeMwS9QW/Gp83w/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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