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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3cb071507d4bdd78d285c2104d437825985e5fe8cc323535078c1fbde7abac' 
  AND token = '6UnWOOztjs0c/Vviqpq+Ci2KjFjNNfiIdQP74K0/f34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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