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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea12e1dfaa59ddde068e1bbf4aa8799efca7a89bf6019d2d7e182b4b67fecad' 
  AND token = 'jaI2NYwFPn7TEeA00iDWS2OqyE5WruhmsrGp9HYjm/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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