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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c563d7933e5570c1ff5d3d0cab632211a766929cb321924992f0105027ac365' 
  AND token = 'sQOf4H1sOxJColiY0KFgcZEber5ywTHxKg3gBUNyZjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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