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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76906d4966a219f82fa8820fb41ab601b7bba2776638278c61071b7a396c4b54' 
  AND token = 'OgtLekHKmHkblN4TyALj28Xv4H6yb1vj4qPBKhoF6Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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