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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05fb8d3872595eaf41ae577038a198f7052994f97deb14ec529d056b3514eb4' 
  AND token = 'dDX2bQUvYb2TULMxRoUEmiRoCvP2LM5Skd951/PKzTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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