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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56eca36f39241a717f173faa0e3957c1d61c9b2138736ca8ba47f0978cc51d32' 
  AND token = 'CgNnEjKPI7s79+pG0eQSMg+P6iO7hfZ1ao69+bmxnT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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