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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5ad634ac0b6dc052c4e34588f26824ed60a1955addfb4f15b29423446ee3c6' 
  AND token = 'ywh8LAb+S/bGWwex9QSbHW5c0o39E+xx6OLGtKYbjoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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