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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05edb0e0bec86c6f62d99e274ef723f0792e2b15456de7244f579db7b3173b1c' 
  AND token = 'fBlR6Yjj9s8c0Sq79TaNEgEwYPdxLOSBWNcm+86j31I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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