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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb348a79acd2a64a523b2d4b49f86b6131de647ec3a8ead99f71050c3ad04d46' 
  AND token = 'UfmGCjPCXLQWAoUv07CLcw3xOQI1qO9SV8QytmoHakY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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