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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5c926f1d123bddf23081f8e5f230f1f68b1e543cc8ff8db9da7cdda0f627ec' 
  AND token = '2TDrj7WUeqgqSFvCKG8nG8E5MR3gzbZ4wQjZmC5e4dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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