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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bded19c85da41874b7509e082f52118167a9deb3f259bf7145b5502e9d5b32a' 
  AND token = 'UCO3SE3TEMQH+PuLBNGSVdkaQK03GtUR4x0ZsIoi/xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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