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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295d62699d96c4be81785d5f6b862e8f459b1409e40c1fbf5cd84c0af14f50c8' 
  AND token = 'vTAOG8BbxnFZHQ0BiWyHNpf5YgyboTH54xgFG6mUW5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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