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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557c1d971ceb8c87545029fa73f549e2f034ae55779538a4aef1bc98514375e9' 
  AND token = '8SxGZn3X8Nh+rtJn5Rh3nHn1SVCyV9FCCw17oooQ1mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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