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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93354a668b882208241d5231871e0118f0534e7b485000d6bb05b04a1a51832c' 
  AND token = 'O+P/9ZAu4cdcBpnABuBWeOcBHT6A6igLBz4EU4ufa6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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